Hello, I have a 2000 excursion with a 7.3l, 4" exhaust with 6"tip, k&n air filter. I recently turned over 200000 miles and I have noticed my fuel milage going down. I used to get 15 pretty much no matter what except when I towed my 34' toyhauler and it would go down to 10. Now I get 12 and 8. I faithfully change the oil (even the top 3 quarts) and the fuel filter. I put in fuel aid every service also. Is there anything I can do to get it back? I was also reading that it is a good idea to flush the motor, but I don't know what to use on a diesel? Someone mentioned the napa engine flush is good. if so do you use only 1 can or more because of the oil capacity?

no, I don't have any mods, but I was thinking of trying one that would help with mpg, any recommendations? what filter would you recommend running? I live in southern ca, Hesperia to be exact. no, I don't run the a/c any more than usual. any other ideas I could check it might just be getting old!!!!

Get a 6637 air filter if u can have those in CA. your injectors are probably starting to lose life and that will decrease mileage greatly. Also clean EBPS tube and sensor. And get a Hydra or some type of similar tuner and you should be back near the 20s if all of that was done Including injectors.

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